While many of Marcos's credits are for ink art over another artist's pencil art, Marcos is an established plotter and illustrator in his own right, a function which was performed ably on the entire original DC TNG volume 1 mini-series. Marcos' career began in native Peru doing political cartoons and newspaper illustrations in the 1950s and 1960s, branching out into comic books later. Traveling to the United States, Pablo Marcos settled in New Jersey and worked on American comics for both DC and Marvel.